Ok, here is my conclusion.
At fist, Radioactive applied for admin, and you deadmin'd him.
As revenge, he became Kitty Daylight, and did it again.
Your impostor has nothing to do with radioactive.
Radioactive has never been named Kewl Kid 1, or anything similar.
Starbunny, on the other hand, can either be:
Random Impostor
Alt of Radioactive!
And that is my conclusion.